<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

        div{
            display: inline-block;
        }
        .box{
            width:100px;
            height:50px;
            border:10px solid;
            border-radius: 50px 50px 0px 0px;
        }

        .bottom{
            width:100px;
            height:50px;
            border:10px solid;
            border-radius: 0px 0px 50px 50px;
        }

        .left{
            width: 50px;
            height:100px;
            border:10px solid;
            border-radius: 50px 0px 0px 50px;
        }

        .right{
            width: 50px;
            height:100px;
            border:10px solid;
            border-radius: 0px 50px 50px 0px;
        }


    </style>
</head>
<body>
    <div>
    <div class="box"></div>
    <div class="bottom"></div>
    <div class="left"></div>
    <div class="right"></div>

        


</div>
</body>
</html>